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DewPro MMR31
Moisture Analyzer
The MMR 31
Loop Powered Moisture Analyzer represents a simple, cost-effective
solution for mid-range moisture measurements. Whether you need to improve
product economy, increase product quality, maintain comfort levels, or
preserve the properties of stored foods or other supplies, the MMR31
allows application flexibility. The MMR31 can also be quickly recalibrated
in the field using salt bottles. A second, isolated loop for temperature
is optional. (U.S. patent #5,677,476)
Features:
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Economical, versatile
analyzer measures relative humidity,
dew point, absolute humidity, mixing
ratio |
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Proven polymer capacitive sensor for fast
responseand calibration stability |
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0 to 100% RH
or dew point measurement range of
-15°C to +85°C |
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Simple, two-wire connection (4 to 20 mA) |
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Easy
mounting with standard compression fittings |
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Simple field recalibration with salt bottles |
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NEMA 4X
(IP67) Enclosure
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Options:
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Wall mount kit |
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Integral Display with user interface |
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English or Metric
fittings |
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DewPro Communication Software |
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Second
isolated loop (patented)
for temperature |
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External display
available with loop-power supply and alarm
contacts
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原廠目錄下載 (PDF Format, 1 pages,
119 KB.)
DewPro
MMR31 Humidity Transmitter
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SPECIFICATIONS
Sensing Element: Silicon-based polymer, capacitance principle, IC
electronics
RH Range: 0 to 100%
RH Accuracy:
± 2% in the range of 0% to 90%
± 3% in the
range of 90% to 100%
Dew Point Range:
-15°C to +85°C (+5°F to +185°F)
Dew Point Accuracy: Better than
± 1°C (± 1.8°F) if T>30°C (86°F) and RH>40%, T<30°C (86°F) and
RH>30%
Repeatability: ± 1°C (± 1.8°F)
Operating
Temperature Range: -15°C to +85°C (+5°F to
+185°F); temp. signal available with second loop
Temperature Accuracy: 0.5°C (±
32.9°F)
Absolute Humidity Range:
1 to 350 g/m3
Mixing Ratio Range: 1 to 830
g/kg
Maximum Operating
Pressure: 250 psia (17 bar)
Outputs: Loop current 4 to 20
mA; 16(A resolution Optional output for temperature
Electronics: Microprocessor
controlled
EMI/RFI Protection: Meets IEC 801-1 through 801-6
Moisture Units: % RH, dew point
temperature in °F or °C, absolute
humidity in g/m3, or
mixing ratio in g/kg, hardware selectable
Power Supply: 24 V DC nominal,
12 to 32 V DC range, or tolerance +8 V DC to –15 V DC
Protection: NEMA 4X (IP
66)
Probe Tube: 316
SS, 1/2” (12.7 mm) diameter, insertion length 3.0” (75 mm) to 5.9” (150
mm), adjustable
Typical Probe
Mounting: 1/2” tube x 1/2” MNPT or 1/2” tube x G
1/2 compression fitting
Weight:
4.4 lbs (2 kg)
Ordering Information MMR31
1 2 3 4 5
1 Approvals
R Standard (not certified, for use in safe areas)
Y
Other
2 Process Connection
1 3” diameter galvanized floor flange with 12.7 mm (1/2”
MNPT)
compression fitting
3
1/2” MNPT compression fitting
6 No mounting hardware
8 G 1/2
compression fitting (male thread), gasket, SS ferrule
9
Other
3 Protective Cap
A Standard 100 micron sintered filter
Y
Other
4 Enclosure Conduit
1 1/2” FNPT with cable gland and plug
2 PG 16 (female)
with cable gland and plug
9 Other
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Configuration
A One 4 to 20 mA selectable: RH 0
to 100% or dew point -15°C to +85°C (5°F to 185°F), absolute humidity,
mixing ratio, no display, fault status 22mA
B Two 4 to 20 mA output
loops: Moisture and temperature -15°C to +85°C (5°F to 185°F), no display,
fault status 22mA
C As A, fault status: Hold
D As A, fault status:
3.6 mA
E As B, fault status: Hold
F As B. fault status: 3.6 mA
G
As A but with integral display, user interface
H As B but with integral
display, user interface
Y Other
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DewPro MMR31 Moisture Analyzer